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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76315b6d1cb838b461a9be9b36d91c34bed8d571943784968d64737415ad0bec' 
  AND token = '3qQNKjIt28+d6T51AIfAUVp6JOBL+yTMdoDoNA38mug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}